If you mix the facial emotions of Kermit, the color of Ernie from 'Sesame Street,' and a little bit of Michael Cera, what do you get? Walter, the newest addition to the Muppet cast! With 'The Muppets' opening nationwide next week, there have been plenty of recent stories, interviews and fun facts about Jim Henson's famous creations. Now comes a New York Times profile of Walter, the Muppet who plays Jason Segel's adopted brother in the film. Most studios would likely use a new Muppet to help sell merchandise and theme park rides, but the folks at Disney were surprisingly hands off when it came time to creating a new character.